<?php

require_once 'HTMLPurifier/AttrTransform.php';

/**
 * Pre-transform that changes converts a boolean attribute to fixed CSS
 */
class HTMLPurifier_AttrTransform_BoolToCSS
extends HTMLPurifier_AttrTransform {
	
	/**
	 * Name of boolean attribute that is trigger
	 */
	var $attr;
	
	/**
	 * CSS declarations to add to style, needs trailing semicolon
	 */
	var $css;
	
	/**
	 * @param $attr string attribute name to convert from
	 * @param $css string CSS declarations to add to style (needs semicolon)
	 */
	function HTMLPurifier_AttrTransform_BoolToCSS($attr, $css) {
		$this->attr = $attr;
		$this->css  = $css;
	}
	
	function transform($attr, $config, &$context) {
		if (!isset($attr[$this->attr])) return $attr;
		unset($attr[$this->attr]);
		$this->prependCSS($attr, $this->css);
		return $attr;
	}
	
}

